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I saw this in someone's code:

y = img_index // num_images

where img_index is a running index and num_images is 3.

When I mess around with // in IPython, it seems to act just like a division sign (i.e. one forward slash). I was just wondering if there is any reason for having double forward slashed?

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The reason for // is because, in Python 3, they made the / operator do a floating-point division, and to get integer division we have  // operator i.e quotient without remainder; When you work with Python 2, where the / operator was simply integer division, unless one of the operands was already a floating-point number.

In Python 2.X you will do as follows:

>>> 10/3 


# to get a floating point number from integer division:

>>> 10.0/3


>>> float(10)/3


While in Python 3:

>>> 10/3


>>> 10//3